lives on Rongelap Island. The people obtain most of their food from Rongelap with occasional supplemental trips to Eniaetok and to other southern islands in the atoll. Little or no activities currently takes place on Naen or Kabelle, or other islands in the north. Figure 2 is a graphic presentation of the measurement points and exposure rates along the main road of Rongelap Island. uniform averaging 7.3 uR/hr over the island. The exposure rate is fairly - This is about twice the background radiation level of uncontaminated atolls in the Marshall Islands, Tables 7, 8 and 9 present the data for the islands surveyed in the Utirik Atoll. These islands, Aon, Eorukku and Utirik, represent the major islands within the atoll. Aon, located in the southwest corner and Utirik located in the south- east corner of the atoll, are the major areas for living and food production. external exposure rate The for all these islands is about 4 uR/hr, i.e., very near the regional background level. Tables 10, 11, 12 and 13 present the RSS-111 survey results for Wormej and Wotje Islands of Wotje Atoll and for Bigen and Ailuk Islands of Ailuk Atoll. These islands were surveyed to determine whether they were representative of baseline external exposure rates for the Marshall Islands. The individual island averages are found in Table 14, but range from 3.7 »R/hr to 3.9 uR/hr. These exposure rates are about the same as that for Kwajalein and other areas not exposed to gross contamination from fallout; we assumed them to be representative of ambient background radiation levels for the region. Discussion of Results The average exposure rate as measured for each island is listed in Table 14. In all areas, except for Rongelap Atoll and Rongerik Atoll where only Eniwetak Island was visited, there is essentially an uniform exposure rate within the islands of a given atoll. For hypothetical inhabitants of Eniwetak Island at Rongerik Atoll,